#region Copyright (c) 2007 Ryan Williams <drcforbin@gmail.com>
/// <copyright>
/// Copyright (c) 2007 Ryan Williams <drcforbin@gmail.com>
/// 
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
/// 
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
/// 
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.
/// </copyright>
#endregion

using System;
using System.Collections.Generic;
using System.Text;

using Mono.Cecil;
using Mono.Cecil.Metadata;

namespace Obfuscar
{
	/// <summary>
	/// Used to identify the signature of a method by its name and parameters.
	/// </summary>
	class NameParamSig : ParamSig, IComparable<NameParamSig>
	{
		readonly string name;
		readonly int hashCode;

		public NameParamSig(string name, string[] paramTypes)
			: base(paramTypes)
		{
			this.name = name;

			hashCode = CalcHashCode();
		}

		public NameParamSig(MethodReference method)
			: base(method)
		{
			name = method.Name;

			hashCode = CalcHashCode();
		}

		public NameParamSig(MethodDefinition method)
			: base(method)
		{
			name = method.Name;

			hashCode = CalcHashCode();
		}

		private int CalcHashCode()
		{
			return name.GetHashCode() ^ base.GetHashCode();
		}

		public string Name
		{
			get { return name; }
		}

		public virtual bool Matches(MemberReference member)
		{
			MethodReference methodRef = member as MethodReference;
			if (methodRef != null)
			{
				if (methodRef.Name == Name && methodRef.Parameters.Count == ParamTypes.Length)
				{
					for (int i = 0; i < ParamTypes.Length; i++)
					{
						if (Helper.GetParameterTypeName(methodRef.Parameters[i]) != ParamTypes[i])
							return false;
					}

					return true;
				}
			}

			return false;
		}

		public bool Equals(NameParamSig other)
		{
			return other != null &&
				name == other.name &&
				Equals((ParamSig)other);
		}

		public override bool Equals(object obj)
		{
			return obj is NameParamSig ? Equals((NameParamSig)obj) : false;
		}

		public static bool operator ==(NameParamSig a, NameParamSig b)
		{
			if ((object)a == null)
				return (object)b == null;
			else if ((object)b == null)
				return false;
			else
				return a.Equals(b);
		}

		public static bool operator !=(NameParamSig a, NameParamSig b)
		{
			if ((object)a == null)
				return (object)b != null;
			else if ((object)b == null)
				return true;
			else
				return !a.Equals(b);
		}

		public override int GetHashCode()
		{
			return hashCode;
		}

		public override string ToString()
		{
			return String.Format("{0}[{1}]", name, ParamTypes.Length);
		}

		public int CompareTo(NameParamSig other)
		{
			int cmp = String.Compare(name, other.Name);
			if (cmp == 0)
				cmp = CompareTo((ParamSig)other);
			return cmp;
		}
	}
}
